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Diodes Incorporated AZ809NSTR-E1
- Part No.:
- AZ809NSTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ809NSTR-E1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,420
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Product details
Overview
AZ809NSTR-E1 from BCD Semiconductor Manufacturing Limited is a 3-pin microprocessor supervisory IC that monitors VCC supply voltage (3.0V/3.3V/5.0V) and asserts an active-low RESET signal during power-up, power-down, or brown-out events. It features a factory-programmed 3.08V reset threshold (T variant), 240ms typical reset timeout, 8μA typical supply current at 3.3V, and operates across –40°C to +105°C in SOT-23 package - used for reliable reset control in battery-powered embedded systems.
For engineers reviewing the AZ809NSTR-E1 datasheet, AZ809NSTR-E1 pinout, AZ809NSTR-E1 application, or AZ809NSTR-E1 equivalent, key selection criteria include reset threshold accuracy (±30mV at 25°C), guaranteed 140ms minimum timeout, low-quiescent-current operation, and compatibility with Maxim MAX809 replacement requirements in space-constrained designs.
Technical Context
The AZ809NSTR-E1 implements a precision bandgap reference and comparator-based monitoring circuit that triggers reset when VCC drops below its 3.08V threshold (T-grade), with ±0.003%/°C temperature coefficient. Its internal timer ensures reset remains asserted for ≥140ms after VCC recovers above threshold.
It requires no external components, supports full industrial temperature range (–40°C to +105°C), and delivers rail-to-rail output drive capability: VOL ≤ 0.3V at 1.2mA sink (AZ809), VOH ≥ 0.8VCC at 500μA source - enabling direct interface with 3.3V and 5V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±30mV at 25°C; stable over –40°C to +105°C for reliable 3.3V system monitoring |
| Reset Timeout | 240ms typical, 140ms minimum; ensures sufficient processor initialization time after power recovery |
| Supply Current | 8μA typical at 3.3V/25°C; enables multi-year battery life in portable instrumentation |
| Output Type | Active-low open-drain RESET; compatible with pull-up to any logic rail (1.8V–5.5V) |
| Operating Range | VCC = 1.2V to 5.5V; supports wide-input microcontroller and SoC platforms |
| Package | SOT-23 (3-pin); 2.9mm × 1.3mm footprint for high-density PCB layouts |
Pinout & Package
SOT-23 package: 3-pin surface-mount, 1.3mm height, lead-free (E1 suffix), RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and timer; must be low-impedance connection |
| 2 | RESET | Active-low open-drain output; requires external pull-up resistor for logic-level assertion |
| 3 | VCC | Power input (1.2–5.5V); supplies internal reference, comparator, and timing circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | Factory-trimmed ±30mV tolerance at 25°C ensures accurate 3.3V supply supervision without calibration |
| No external components required | Integrated reference, comparator, and timer eliminate BOM cost and layout complexity |
| Ultra-low quiescent current | 8μA typical at 3.3V enables use in always-on battery-backed systems |
| Industrial temperature range | –40°C to +105°C operation supports deployment in automotive infotainment and industrial controllers |
Applications
| Embedded Controllers | Battery Operated Systems |
|---|---|
Use Scenario: Reset coordination for ARM Cortex-M0/M3 microcontrollers during cold start or brown-out. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset pulse and voltage-fail detection. Use Value: Guarantees deterministic boot state by holding MCU in reset until VCC stabilizes above 3.08V for ≥240ms. | Use Scenario: Power management in handheld medical glucose meters with coin-cell batteries. IC Role / Device Role / Timing Role: Low-current voltage monitor triggering controlled shutdown before brown-out corruption. Use Value: 8μA supply current extends battery life beyond 5 years in sleep-mode operation. |
| Intelligent Instruments | Wireless Communication Systems |
Use Scenario: Calibration and firmware integrity protection in portable multimeters. IC Role / Device Role / Timing Role: System supervisor ensuring EEPROM write completion before power loss. Use Value: 140ms minimum reset timeout prevents partial writes during transient supply dips. | Use Scenario: Baseband processor reset sequencing in LPWA modules (LoRaWAN/NB-IoT). IC Role / Device Role / Timing Role: Voltage fault detector synchronizing RF transceiver and modem power states. Use Value: 3.08V threshold matches 3.3V LDO output, preventing false resets during RF transmit current surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD+T | Same 3.08V threshold, but 140ms min timeout (vs. AZ809's 240ms typ), higher 15μA ICC | Valid for legacy designs requiring Maxim pinout and timing; less margin for slow-rising VCC | Select if existing board uses MAX809 footprint and timing budget allows shorter timeout |
| TPS3808G30DBVR | Adjustable threshold via external resistor; 200ms fixed timeout; 1.2μA ICC; requires external component | Used where programmable trip point or ultra-low ICC is mandatory, not drop-in replacement | Choose only when design flexibility justifies added BOM item and layout area |
Compared with MAX809TRD+T and TPS3808G30DBVR, the AZ809NSTR-E1 offers longer guaranteed reset hold time (140ms min vs. 140ms min but 240ms typ), lower operating current than MAX809, and zero external components - making it optimal for cost-sensitive, space-constrained, and long-battery-life applications.
Availability
AZ809NSTR-E1 is available at Aetrix Electronics and suitable for embedded controllers, battery-operated systems, and intelligent instruments requiring stable component supply with full industrial temperature support and RoHS-compliant packaging.
Supply support for AZ809NSTR-E1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and mixed-signal IC designer and foundry partner, specializing in power management, supervisors, and interface solutions for industrial and consumer markets.
The AZ809 series belongs to BCD's microprocessor supervisory product line, engineered specifically for low-power, high-reliability reset generation in portable and harsh-environment electronics - emphasizing precision threshold stability and minimal external dependencies.
FAQ
What is the exact reset threshold voltage for AZ809NSTR-E1?
The AZ809NSTR-E1 has a factory-programmed reset threshold of 3.08V, with tolerance of ±30mV at 25°C and ±75mV over –40°C to +85°C. This corresponds to the "T" option in BCD's ordering code, optimized for 3.3V supply monitoring in embedded systems.
Does AZ809NSTR-E1 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is an open-drain active-low output and must be pulled up externally to the target logic rail (e.g., 3.3V or 5V). Typical pull-up values range from 10kΩ to 100kΩ, selected based on rise time and bus loading requirements.
Can AZ809NSTR-E1 operate with a 1.8V supply?
No - the minimum recommended VCC is 1.2V per datasheet, but functional reset behavior is only specified down to 1.2V with degraded accuracy. For reliable 1.8V system supervision, BCD recommends the AZ803 series (1.6V threshold option), not the AZ809NSTR-E1.
Is AZ809NSTR-E1 pin-compatible with MAX809?
Yes - AZ809NSTR-E1 uses identical SOT-23 pinout (VCC, GND, RESET) and active-low output function as MAX809. However, timing differs: AZ809NSTR-E1 guarantees ≥140ms timeout (240ms typical), while MAX809 specifies ≥140ms min with no typical value - requiring validation in timing-critical designs.
AZ809NSTR-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AZ809NSTR-E1 FAQ
1.How can I place an order for AZ809NSTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ809NSTR-E1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AZ809NSTR-E1 reliable?
The price and inventory of AZ809NSTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ809NSTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ809NSTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ809NSTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ809NSTR-E1?
AZ809NSTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ809NSTR-E1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AZ809NSTR-E1?
For technical support, including AZ809NSTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ809NSTR-E1 requirements.
6.How does Aetrix verify that AZ809NSTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ809NSTR-E1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AZ809NSTR-E1 meets industry standards.
7.What is the process for return or replacement of AZ809NSTR-E1?
All AZ809NSTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ809NSTR-E1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AZ809NSTR-E1 part is unused and in its original packaging.
Return procedure for AZ809NSTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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